Suppose a ray of light traveling in a material with an index of refraction n1 reaches an interface with a material having an index of refraction n2. Which of the following statements must be true for total internal reflection to occur? Check all that apply. The angle of incidence must be less than the critical angle. n1=n2The angle of incidence must be equal to the critical angle. n1>n2
The angle of incidence must be greater than the critical angle.